import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class Test6 {
    public static void main(String[] args) throws NoSuchMethodException {
        try {
            Class clz = Class.forName("Person");
            //获取Person的无参构造:public Person()
            Constructor c1=clz.getDeclaredConstructor();
            //Person的无参构造为public,这里可以直接访问
            Object obj =c1.newInstance();
            System.out.println(obj);
            //获取Person的单参构造：private Person(String)
            Constructor c2=clz.getDeclaredConstructor(String.class);
            //Person的单参构造为private,这里已超出其访问范围,不能直接访问
            //通过setAccessable方法,设定为可以访问
            c2.setAccessible(true);
            obj = c2.newInstance("new Person");
            System.out.println(obj);
            //获取Person的三参构造:protected Person(String,String,String)
            Constructor c3=clz.getDeclaredConstructor(String.class,String.class,String.class);
            //Person的三参构造为protected,这里已超出其访问范围,不能直接访问
            //通过setAccessable方法,设定为可以访问
            c3.setAccessible(true);
            obj=c3.newInstance("new Person","beijing","Hello!");
            System.out.println(obj);

        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }
}
